Build tools require NodeJS - you can use the NodeSource repositories for quick setup:

# Using Ubuntucurl-sLhttps://deb.nodesource.com/setup_7.x|sudo-Ebash-sudoapt-getinstall-ynodejs# Using Debian, as rootcurl-sLhttps://deb.nodesource.com/setup_7.x|bash-apt-getinstall-ynodejs# Using RHEL or centos, as rootcurl-sLhttps://rpm.nodesource.com/setup_7.x|bash-yuminstallnodejs

Changes in ES6, CoffeeScript and LESS files will be recompiled automatically when you refresh the page; Python code will not. Additional debug information will be available in the console output and browser console. Reloading the page with Ctrl-F5 (Cache-Control:no-cache) will unconditionally rebuild all resources